Unicel C-7490-4 Pool, Spa or Hot Tub Filter Cartridge, 4 Pack, White Diameter: 7-inch; length: 32 13/16-inch Top end cap: open with molded gasket, 3 0/0-inch inner diameter; bottom end cap: open with molded gasket, 3 0/0-inch inner diameter Pleat count: 176; filter media: 4-ounce reemay 2040; filter area: 137 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications